Tiller



C- F. HADERER.

TILLER.

APPLICATION FILED NOV. 9, 1917.

Patented July 15, 1919.

srnrns AENT onrron.

CARL F. HADERER, OF WEST ALLIS, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERSMANUFACTURING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OFDELAWARE.

Specification of Letters Iatent.

TILLER.

Application filed November 9, 1917. Serial No. 201,692.

To all whom it may concern:

Be it known that I, CARL F. HADERER, a subject of the Emperor ofGermany, but having declared his intention of becoming a citizen of theUnited States, residing at West Allis, in the county of Milwaukee andState of Wisconsin, have invented the new and useful Tiller of which thefollowing is a specification.

This invention relates to improvements in the construction ofagricultural appliances and has specific relation to improvements inrotary soil-tilling machines.

An object of the invention is to provide a soil tiller which is simplein construction and e'fiicient in operation. One of the more specificobjects is to provide an improved form of disintegrating element forrotary tillers. Another specific obj ect is to provide simple andeflicient means for resiliently and detachably connecting thedisintegrat ing elements to a carrier.

It has heretofore been proposed to construct a rotary tiller ofaplurality of flexible wire hooks secured to a rotating drum and adaptedfor angular displacement relatively to the drum around the axis ofrotation. With this prior device, if a stone or similar obstruction wasencountered by one of the hooks, the obstructed hook would swinginwardly toward and around the axis of rotation, thereby permitting therotor to pass over the obstruction. n It has been found, however, thatin order to provide sufficient stiffness in these wire hooks toeffectively till the soil, the hooks must be made of relatively heavywire which will not readily submit to distortion by obstructions andwhich will often break rather than bend. In order to overcome these:difliculties of the prior devices, the present invention'contemplatesprovision of a disintegrating element which in order to providesufficient rigidity for tilling, is fixed against angular displace mentaround the rotor axis and relatively to its carrier, but which willautomatically move along the rotor axis and avoid injury to the rotor,in case an obstruction is encountered. With the present invention thedisintegrating elements are pivoted in planes perpendicular to the rotoraxis and are automatically maintained'in or returned after displacement,to such planes.

A clear con eption o a em e t f the invention may be had by referring tothe drawingaccompanyingand forming a part of this specification in whichlike reference characters designate the same or similarparts in thevarious views.

. Figure clv is a side elevation of a rotary tiller having one of therear driving wheels omitted therefrom in order to more clearly discloseother details of construction.

Fig. 2 is an enlarged side elevation of a set of three disintegratinghooks secured to a rotary carrier.

Fig. 3 is an enlarged top elevation of a cam bracketadapted to center anadjacent hook and to automatically return the hook to normal afterdisplacement thereof.

4 is an enlarged end elevation. of the cam bracket shown in Fig. 3.

.The tractor which impels the rotary tilling device comprises a mainframe 2-supported by a pair of reartraction wheels and a frontsteeringwheel :4. The rear traction wheels 6 are propelled by means ofan engine 3 of usual construction through the usual trans-missiongearing. The front steering wheel is' manipul-able by means of a handcontrol 5. Secured to the rear end of the frame 2 is a rotor controllingand driving mechanism 7 which supports and forms a power transmissionmeans for the tilling mechanism. i

. The mechanism 7 and the associated tilling mechanism, may be raised bymeans of motor operated lifting mechanism which is mounted on the rearof the main frame 2 and is controllable from the drivers seat.

Thetilling mechanism comprises a carrier 8 drivingly connected to a maindrive shaft 9 and having mounted thereon a plurality ofdisintegratingelements. Each of the disintegrating elements comprises a spring arm .10a head 11 locked to the spring arm by means of a cross pin 17 and arenewable point 12 fitting a tapered hole in the head 11. The innerextremities of the spring arm 10 are bent to] form pivots which engageopenings 21 in brackets 13, 14 respectively. .The brackets 13, 14 aredetachably secured to the carrier 8 by means of cap screws.

Each of the rear brackets 13 is provided with a pair of-warped or camsurfaces 18 which extend laterally away from a rectilinealcenteringrecess 19, see Figs. 3 and The ente i g miss-19 lies in the P ns of thecorresponding pivot openings 21 and has a surface which engages the adacent spring armlO and normally retains the same axis, that thespringarm 10 coacting there-- with is under considerable tension whereby thearm 10 is prevented from moving outof central or mid position unlesslateral pressure is exerted against the outer-extremitythereof. Byexertinglateralpressure against the spring arm 10 the same may be movedout of its normal central plane to a position such as indicated by dotand dash lines in Figs. 3 and 4. During this lateral movement of the arm10 the portion thereof which normally rests in the recess '19, ridesupon one'of the cam surfaces '18 and partially withdraws theadjacentbent end of the arm from its pivot opening 21 as indicated in Fig. 4,thereby augmenting the tension in the arm 10. Upon releasing the lateralpressure upon the arm, the tension therein assisted by centrifugalforce, causes the arm 10 to automatically ride back turned to-centralposition upon over the adjacent v cam surface 18 and to reassume itsnormal mid position. By providing. double cam surfaces 18, the disinteegrating elements will be automatically relateral displacement thereof ineither direction.

During the normal operation of the tiller the tractor which impels therotor is ad vanced by means of the engine 3, the direction of motionbeing controlled by meansof the handcontrol 5. Operation of the tillerrotor is controlled by means of levers v27 which control the raising andlowering of the rotor as well as the rotation thereof; I

The depth of tilling is controlled by means of a gage 15 associated withthe tiller rotor,

and the deflector 16 prevents material from belng thrown upon thetractor. While till ing, the rotor revolves in a clockwise directionas-viewed in Figs. 1 and 2, the points 12 being driven through thesoilat'a'relatlvely high rate of speed and thoroughly dislntegra'tingthe same. r

If, while tilling the soil, a stone or similar obstruction isencountered by One of the points v12, the'correspondin'g disintegratingelement will be moved laterally by virtue of the side thrust induced bythe lateral com ponentof the resisting force. 'It has been found that ina great majority of thecases where an obstruction is encountered, suchobstruction does produce a lateral component of force which will tend'tomove the disintegrating element laterally; The lateral'motion of theobstructed disintegrating element will continue until this'element isable tov clear the obstruction, whereupon the disintegrating elementpasses the obstruction and eventually automatically returns to itsnormalor mid position. If the obstruction will not. produce lateralmotion of the obstructed disintegrating element, the enmoved by strikingthe small rear ends thereof, so that replacement thereof is readilyeffected. The spring' arms 10 may be readily removed either by pry ngthe bent ends thereof out of the openings-21 or by removing the boltswhich normally retain in place the brackets 13, 14. The bolt holes ofthese brackets may be made --slightly larger thanthe correspondingboltsinorder to permitsome degree of'adjustment so as to vary thetension of the corresponchng springarms. W

' It shouldbe understoodthat it is not desiredto'belimited to the exactdetails herein shown and described,'for obvious modifications within thescope of thefapp ended claims may occur'to a person skilled in the art.7 5. qIti's claimed and ters'Patent:

1. As an article of manufacture, a disintegrating element comprising a.bifurcated arm having 'a socket associated "therewith, and adisintegrating tool frictionally held within said socket and lyingin theplane of thebifurcations ofsaid arm.

desired tosecure by Let ;;2. As an article of manufacture,a disinte formpivots, and a disintegrating tool-asso-' ci'ated with said arm andlying'in the plane of said pivots. I I 7 4. In a tiller, a carrierhaving an axis, a

bifurcated spring arm associated with said 7 carrier andrevoluble aboutsaid axis, means for stressing the bifurcations of said arm by relativemotion in the planethereof upon shifting said arm along said'axis, and adisintegratingjtool associated with said arm.

'5. In. a tiller, a carrier having anaxis, a

bifurcated spring arm revoluble about said axis, the ends of the armbifurcations being associated with saidcarrier'to prevent rearwarddisplacement of sa d arm about sald axis relatively to said carrier,means for stressing said bifurcations by relative 1110- tion in theplane thereof upon shifting of said arm along said axis, and adisintegrating tool associated with said arm.

6. In a tiller, a carrier having an axis, a bifurcated spring armrevoluble about said axis, the ends of the arm bifurcations being bentinto alinement with each other, means connecting said bent ends to saidcarrier to prevent rearward displacement of said arm about said axisrelatively to said carrier, means for stressing said bifurcations byrelative motion in the plane thereof upon shifting of said arm alongsaid axis, and a disintegrating tool assoclated with said arm.

7 In a tiller, a carrier having an axis, a

bifurcated spring arm revoluble about said axis, the ends of the armbifurcations being bent into alinement with each other, means connectingsaid bent ends to said carrier to prevent rearward displacement of saidarm about said axis relatively to said carrier, means comprising anelement having a cam surface engageable with a bifurcation of said armto stress said bifurcations by relative motion in the plane thereof uponshifting of said arm about said bent ends, and a disintegrating toolassociated with said arm.

In testimony whereof, the signature of the inventor is affixed hereto.

CARL F. HADERER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

